GlobalOpt: fix an issue where CXAAtExitFn points to a deleted function.

CXAAtExitFn was set outside a loop and before optimizations where functions
can be deleted. This patch will set CXAAtExitFn inside the loop and after
optimizations.

Seg fault when running LTO because of accesses to a deleted function.
rdar://problem/13838828

llvm-svn: 181838

1 files changed, 3 insertions, 3 deletions

diff --git a/llvm/lib/Transforms/IPO/GlobalOpt.cpp b/llvm/lib/Transforms/IPO/GlobalOpt.cpp
index 0ef900e2b9a..4a9cb27b034 100644
--- a/llvm/lib/Transforms/IPO/GlobalOpt.cpp
+++ b/llvm/lib/Transforms/IPO/GlobalOpt.cpp
@@ -3323,8 +3323,6 @@ bool GlobalOpt::runOnModule(Module &M) {
   // Try to find the llvm.globalctors list.
   GlobalVariable *GlobalCtors = FindGlobalCtors(M);
 
-  Function *CXAAtExitFn = FindCXAAtExit(M, TLI);
-
   bool LocalChange = true;
   while (LocalChange) {
     LocalChange = false;
@@ -3342,7 +3340,9 @@ bool GlobalOpt::runOnModule(Module &M) {
     // Resolve aliases, when possible.
     LocalChange |= OptimizeGlobalAliases(M);
 
-    // Try to remove trivial global destructors.
+    // Try to remove trivial global destructors if they are not removed
+    // already.
+    Function *CXAAtExitFn = FindCXAAtExit(M, TLI);
     if (CXAAtExitFn)
       LocalChange |= OptimizeEmptyGlobalCXXDtors(CXAAtExitFn);